2019
|
C Lacava, M A Ettabib, T D Bucio, G Sharp, A Z Khokhar, Y Jung, M Sorel, F Gardes, D J Richardson, P Petropoulos, P Petropoulos, F Parmigiani Intermodal bragg-scattering four wave mixing in silicon waveguides Journal Article Journal of Lightwave Technology, 37 (7), pp. 1680–1685, 2019. Abstract | Links | Tags: frequency generation, intermodal, intermodal four wave mixing, silicon, Silicon photonics, silicon-rich, wavelength conversion, wavelength converter @article{Lacava2019,
title = {Intermodal bragg-scattering four wave mixing in silicon waveguides},
author = {C Lacava and M A Ettabib and T D Bucio and G Sharp and A Z Khokhar and Y Jung and M Sorel and F Gardes and D J Richardson and P Petropoulos and P Petropoulos and F Parmigiani},
doi = {10.1109/JLT.2019.2901401},
year = {2019},
date = {2019-01-01},
journal = {Journal of Lightwave Technology},
volume = {37},
number = {7},
pages = {1680--1685},
abstract = {We demonstrate optical wavelength conversion in a multi-mode silicon waveguide using four wave mixing Bragg scattering enabled by a dual-pump CW scheme. The original signal and the generated idler pair excite one spatial mode (first, TE mode), while the two pumps excite a different spatial mode (second, TE mode) of the same waveguide. Our approach exploits the differences in the group velocities of the various supported spatial modes to ensure phase matching only for the desired nonlinear process. In this proof-of-principle experiment, any unintended idlers are generated with an extinction ratio up to 12 dB relative to the phase-matched idlers for a pumps-to-signal-idler-pair wavelength detuning of about 70 nm. The scalability of the scheme to achieve larger and multiple signal wavelength detunings from the pump frequencies is also discussed.},
keywords = {frequency generation, intermodal, intermodal four wave mixing, silicon, Silicon photonics, silicon-rich, wavelength conversion, wavelength converter},
pubstate = {published},
tppubtype = {article}
}
We demonstrate optical wavelength conversion in a multi-mode silicon waveguide using four wave mixing Bragg scattering enabled by a dual-pump CW scheme. The original signal and the generated idler pair excite one spatial mode (first, TE mode), while the two pumps excite a different spatial mode (second, TE mode) of the same waveguide. Our approach exploits the differences in the group velocities of the various supported spatial modes to ensure phase matching only for the desired nonlinear process. In this proof-of-principle experiment, any unintended idlers are generated with an extinction ratio up to 12 dB relative to the phase-matched idlers for a pumps-to-signal-idler-pair wavelength detuning of about 70 nm. The scalability of the scheme to achieve larger and multiple signal wavelength detunings from the pump frequencies is also discussed. |
P Minzioni, C Lacava, T Tanabe, J Dong, X Hu, G Csaba, W Porod, G Singh, A E Willner, A Almaiman, J Laurat, J Nunn Roadmap on all-optical processing Journal Article Journal of Optics (United Kingdom), 21 (6), 2019. Abstract | Links | Tags: silicon nitride, Silicon photonics, surface coupler, transceiver, wavelength conversion, wavelength converter @article{Minzioni2019,
title = {Roadmap on all-optical processing},
author = {P Minzioni and C Lacava and T Tanabe and J Dong and X Hu and G Csaba and W Porod and G Singh and A E Willner and A Almaiman and J Laurat and J Nunn},
doi = {10.1088/2040-8986/ab0e66},
year = {2019},
date = {2019-01-01},
journal = {Journal of Optics (United Kingdom)},
volume = {21},
number = {6},
abstract = {The ability to process optical signals without passing into the electrical domain has always attracted the attention of the research community. Processing photons by photons unfolds new scenarios, in principle allowing for unseen signal processing and computing capabilities. Optical computation can be seen as a large scientific field in which researchers operate, trying to find solutions to their specific needs by different approaches; although the challenges can be substantially different, they are typically addressed using knowledge and technological platforms that are shared across the whole field. This significant know-how can also benefit other scientific communities, providing lateral solutions to their problems, as well as leading to novel applications. The aim of this Roadmap is to provide a broad view of the state-of-the-art in this lively scientific research field and to discuss the advances required to tackle emerging challenges, thanks to contributions authored by experts affiliated to both academic institutions and high-tech industries. The Roadmap is organized so as to put side by side contributions on different aspects of optical processing, aiming to enhance the cross-contamination of ideas between scientists working in three different fields of photonics: optical gates and logical units, high bit-rate signal processing and optical quantum computing. The ultimate intent of this paper is to provide guidance for young scientists as well as providing research-funding institutions and stake holders with a comprehensive overview of perspectives and opportunities offered by this research field.},
keywords = {silicon nitride, Silicon photonics, surface coupler, transceiver, wavelength conversion, wavelength converter},
pubstate = {published},
tppubtype = {article}
}
The ability to process optical signals without passing into the electrical domain has always attracted the attention of the research community. Processing photons by photons unfolds new scenarios, in principle allowing for unseen signal processing and computing capabilities. Optical computation can be seen as a large scientific field in which researchers operate, trying to find solutions to their specific needs by different approaches; although the challenges can be substantially different, they are typically addressed using knowledge and technological platforms that are shared across the whole field. This significant know-how can also benefit other scientific communities, providing lateral solutions to their problems, as well as leading to novel applications. The aim of this Roadmap is to provide a broad view of the state-of-the-art in this lively scientific research field and to discuss the advances required to tackle emerging challenges, thanks to contributions authored by experts affiliated to both academic institutions and high-tech industries. The Roadmap is organized so as to put side by side contributions on different aspects of optical processing, aiming to enhance the cross-contamination of ideas between scientists working in three different fields of photonics: optical gates and logical units, high bit-rate signal processing and optical quantum computing. The ultimate intent of this paper is to provide guidance for young scientists as well as providing research-funding institutions and stake holders with a comprehensive overview of perspectives and opportunities offered by this research field. |
A Xomalis, Y Jung, I Demirtzioglou, C Lacava, E Plum, D J Richardson, P Petropoulos, N I Zheludev Nonlinear control of coherent absorption and its optical signal processing applications Journal Article APL Photonics, 4 (10), 2019. Abstract | Links | Tags: nonlinear optics, wavelength conversion, wavelength converter @article{Xomalis2019,
title = {Nonlinear control of coherent absorption and its optical signal processing applications},
author = {A Xomalis and Y Jung and I Demirtzioglou and C Lacava and E Plum and D J Richardson and P Petropoulos and N I Zheludev},
doi = {10.1063/1.5123547},
year = {2019},
date = {2019-01-01},
journal = {APL Photonics},
volume = {4},
number = {10},
abstract = {All-optical data processing continues to attract significant interest as a way to overcome the electronic signal processing bottleneck of fiber telecommunication networks. Nonlinear optical devices such as limiters and saturable absorbers rely on intensity-dependent attenuation of light. However, making such devices using intensity-dependent multiphoton dissipation processes is an issue as these make complete absorption and transmission impossible. Here, we show that nonlinear phase retardation in an optical fiber can control the dissipation of coherent light waves interacting on a thin plasmonic absorber from total absorption to perfect transmission. The fiber's instantaneous Kerr nonlinearity and the femtosecond coherent absorption time scale make this approach ultrafast. We report proof-of-principle demonstrations of all-optical intensity discrimination, power limiting, pulse restoration, pulse splitting, and signal transfer between carrier wavelengths within a fiber circuit. Our results indicate that nonlinear control of coherent absorption can imitate and outperform saturable and multiphoton absorption in terms of bandwidth and contrast.},
keywords = {nonlinear optics, wavelength conversion, wavelength converter},
pubstate = {published},
tppubtype = {article}
}
All-optical data processing continues to attract significant interest as a way to overcome the electronic signal processing bottleneck of fiber telecommunication networks. Nonlinear optical devices such as limiters and saturable absorbers rely on intensity-dependent attenuation of light. However, making such devices using intensity-dependent multiphoton dissipation processes is an issue as these make complete absorption and transmission impossible. Here, we show that nonlinear phase retardation in an optical fiber can control the dissipation of coherent light waves interacting on a thin plasmonic absorber from total absorption to perfect transmission. The fiber's instantaneous Kerr nonlinearity and the femtosecond coherent absorption time scale make this approach ultrafast. We report proof-of-principle demonstrations of all-optical intensity discrimination, power limiting, pulse restoration, pulse splitting, and signal transfer between carrier wavelengths within a fiber circuit. Our results indicate that nonlinear control of coherent absorption can imitate and outperform saturable and multiphoton absorption in terms of bandwidth and contrast. |
2016
|
C Lacava, M A Ettabib, I Cristiani, J M Fedeli, D J Richardson, P Petropoulos Ultra-Compact Amorphous Silicon Waveguide for Wavelength Conversion Journal Article IEEE Photonics Technology Letters, 28 (4), pp. 410–413, 2016. Abstract | Links | Tags: BSPK, nonlinear optics, QPSK, Silicon photonics, wavelength converter @article{Lacava2016,
title = {Ultra-Compact Amorphous Silicon Waveguide for Wavelength Conversion},
author = {C Lacava and M A Ettabib and I Cristiani and J M Fedeli and D J Richardson and P Petropoulos},
doi = {10.1109/LPT.2015.2496758},
year = {2016},
date = {2016-01-01},
journal = {IEEE Photonics Technology Letters},
volume = {28},
number = {4},
pages = {410--413},
abstract = {In this letter, we demonstrate, for the first time, successful four wave mixing (FWM)-based wavelength conversion of binary phase shift keyed (BPSK) and quadrature phase shift keyed (QPSK) signals, at 20-Gb/s bitrate, in a 1-mm long amorphous silicon waveguide. A maximum FWM-efficiency of -26 dB was achieved by employing a pump power of just 70 mW, establishing this technology as a contender for the development of ultra-compact, low power, silicon photonics wavelength converter. Bit error ratio measurements demonstrated successful conversion with less than 1 dB penalty level, for both BPSK and QPSK signals (at BER = 10-5).},
keywords = {BSPK, nonlinear optics, QPSK, Silicon photonics, wavelength converter},
pubstate = {published},
tppubtype = {article}
}
In this letter, we demonstrate, for the first time, successful four wave mixing (FWM)-based wavelength conversion of binary phase shift keyed (BPSK) and quadrature phase shift keyed (QPSK) signals, at 20-Gb/s bitrate, in a 1-mm long amorphous silicon waveguide. A maximum FWM-efficiency of -26 dB was achieved by employing a pump power of just 70 mW, establishing this technology as a contender for the development of ultra-compact, low power, silicon photonics wavelength converter. Bit error ratio measurements demonstrated successful conversion with less than 1 dB penalty level, for both BPSK and QPSK signals (at BER = 10-5). |
